The fire began in a mechanical area of the one-story building at 3249 W. Harrison Street in the Homan Square neighborhood when a broken light sparked on the floor and ignited spilled gasoline, according to the Chicago Fire Department's news office. Firefighters were called to the building a little after 7 p.m.

Part of the building's roof had collapsed by about 7:45 p.m., according to the fire department. By about 7:55 p.m., part of the building's back wall had collapsed, and firefighters anticipated "total structure failure," the department's news office said in a Twitter message.

By about 8 p.m., fire command at the scene called a hazardous materials response because of the burning gasoline and natural gas at the site.

The building housed the Mr. Clean car wash and the Heavenly Visions hair salon and barber shop, according to the Chicago Fire Department and photos from the scene.

The fire was still burning about 9:45 p.m., though it was confined to the salon at the west end of the building, according to the fire department.

NAVAL STATION NORFOLK — The Navy on Saturday commissioned the USS John Warner, adding a 12th Virginia-class submarine to the fleet and celebrating the legacy of its namesake, the retired senator who was hailed as a statesman.